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Comparison of CT Methods for Determining the Fat Content of the Liver

Yoshihisa Kodama1, Chaan S. Ng1, Tsung T. Wu2, Gregory D. Ayers3, Steven A. Curley4, Eddie K. Abdalla4, Jean Nicolas Vauthey4 and Chusilp Charnsangavej1

1 Department of Diagnostic Radiology, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Blvd., Box 368, Houston TX 77030.
2 Department of Pathology, The University of Texas M. D. Anderson Cancer Center, Houston TX.
3 Department of Biostatistics and Applied Mathematics, University of Texas M. D. Anderson Cancer Center, Houston TX.
4 Department of Surgical Oncology, The University of Texas M. D. Anderson Cancer Center, Houston TX.


Figure 1
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  		Fig. 1A —Regions of interest for measurement of attenuation. Sectors and borders are defined with modification of Couinaud segmentation system. Dashed lines indicate borders between sectors. RHV = right hepatic vein, MHV = middle hepatic vein, IVC = inferior vena cava. Schematic shows level of confluence of right hepatic vein. LHV = left hepatic vein.

 

Figure 2
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  		Fig. 1B —Regions of interest for measurement of attenuation. Sectors and borders are defined with modification of Couinaud segmentation system. Dashed lines indicate borders between sectors. RHV = right hepatic vein, MHV = middle hepatic vein, IVC = inferior vena cava. Schematic shows level of umbilical portion (UP) of left portal vein.

 

Figure 3
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  		Fig. 1C —Regions of interest for measurement of attenuation. Sectors and borders are defined with modification of Couinaud segmentation system. Dashed lines indicate borders between sectors. RHV = right hepatic vein, MHV = middle hepatic vein, IVC = inferior vena cava. Schematic shows level of posterior branch of right portal vein (PPV). APV = anterior branch of right portal vein.

 

Figure 4
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  		Fig. 2A —64-year-old woman with liver metastasis. Dashed lines indicate borders between sectors. IVC = inferior vena cava. CT scan corresponding to 1A shows regions of interest at level of confluence of right hepatic vein.

 

Figure 5
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  		Fig. 2B —64-year-old woman with liver metastasis. Dashed lines indicate borders between sectors. IVC = inferior vena cava. CT scan corresponding to 1B shows regions of interest at level of umbilical portion of left portal vein.

 

Figure 6
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  		Fig. 2C —64-year-old woman with liver metastasis. Dashed lines indicate borders between sectors. IVC = inferior vena cava. CT scan corresponding to 1C shows regions of interest at level of posterior branch of right portal vein.

 

Figure 7
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  		Fig. 3A —Fat content versus attenuation. Graph shows results for unenhanced CT images. Solid line indicates predictive equation for pathologic fat content given attenuation of resected portion of liver. Pathologic fat content = exp[-exp(-1.915 + 0.051 x resected-liver attenuation)]. Dashed lines indicate upper and lower 90% bounds of pathologic fat content.

 

Figure 8
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  		Fig. 3B —Fat content versus attenuation. Graph shows results for contrast-enhanced CT images. Solid line indicates predictive equation for pathologic fat content given attenuation of resected portion of liver. Pathologic fat content = exp[-exp(-1.781 + 0.024 x resected-liver attenuation)]. Dashed lines indicate upper and lower 90% bounds of pathologic fat content.

 

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